Ignore case differences when searching for or replacing substrings.

  

public class Main {

  public static void main(String args[]) {
    String str = "This is a TEST.";

    // Use matches() to find any version of test.
    if (str.matches("(?i).*test.*"))
      System.out.println("test is in the string.");

  }
}

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Ignore case differences when searching for or replacing substrings. : String Operation « Regular Expressions « Java

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